BotanyStatement A: The optimum CO2 concentration for photosynthesis in C4 plants is lower than C3 plants.Statement B: The optimum CO2 concentration for Rubisco activity for carboxylation is lower than that to PEP carboxylase activity.

Statement A: The optimum CO2 concentration for photosynthesis in C4 plants is lower than C3 plants.

Statement B: The optimum CO2 concentration for Rubisco activity for carboxylation is lower than that to PEP carboxylase activity.

  1. A

    Statement A is correct and B is incorrect.

  2. B

    Statements A and B are correct.

  3. C

    Statement A is incorrect and B is correct.

  4. D

    Statements A and B are incorrect.

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    Solution:

    The optimum CO2 concentration for photosynthesis in C4 plants is 0.036 ppm and to that of C3 plants is 0.045 ppm. The optimum CO2 concentration for Rubisco activity is more than that of PEP carboxylase as the KM value of PEP carboxylase is lesser than that of Rubisco.

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